WO2010143926A2 - Structure de symbole de référence pour un système ofdm étalé par transformée de fourier rapide - Google Patents

Structure de symbole de référence pour un système ofdm étalé par transformée de fourier rapide Download PDF

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Publication number
WO2010143926A2
WO2010143926A2 PCT/KR2010/003814 KR2010003814W WO2010143926A2 WO 2010143926 A2 WO2010143926 A2 WO 2010143926A2 KR 2010003814 W KR2010003814 W KR 2010003814W WO 2010143926 A2 WO2010143926 A2 WO 2010143926A2
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WIPO (PCT)
Prior art keywords
data
symbol
symbols
dft
ofdm symbol
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Ceased
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PCT/KR2010/003814
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English (en)
Korean (ko)
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WO2010143926A3 (fr
Inventor
정병장
서방원
안재영
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Electronics and Telecommunications Research Institute ETRI
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Electronics and Telecommunications Research Institute ETRI
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Priority to US13/377,720 priority Critical patent/US8891662B2/en
Publication of WO2010143926A2 publication Critical patent/WO2010143926A2/fr
Publication of WO2010143926A3 publication Critical patent/WO2010143926A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals
    • H04L27/2613—Structure of the reference signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0224—Channel estimation using sounding signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/2605—Symbol extensions, e.g. Zero Tail, Unique Word [UW]
    • H04L27/2607—Cyclic extensions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2626—Arrangements specific to the transmitter only
    • H04L27/2627—Modulators
    • H04L27/2634—Inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators in combination with other circuits for modulation
    • H04L27/2636—Inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators in combination with other circuits for modulation with FFT or DFT modulators, e.g. standard single-carrier frequency-division multiple access [SC-FDMA] transmitter or DFT spread orthogonal frequency division multiplexing [DFT-SOFDM]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2614—Peak power aspects

Definitions

  • the present invention relates to the field of mobile communications, and more particularly, to a technique for transmitting a reference symbol for channel estimation in an OFDM communication system.
  • DFT spread OFDM Digital Fourier Transform spread Orthogonal Frequency Division Multiplexing
  • CM Cubic Metric
  • PAPR Peak to Average Power Ratio
  • SC-FDMA Single Carrier Frequency Division Multiple Access
  • the reference symbol or pilot signal is transmitted from the data transmitter to the data receiver for channel estimation or the like in the data receiver.
  • a reference symbol is transmitted using one OFDM symbol for each slot. This is to prevent the increase of CM and PAPR when data and reference symbols are mixed in one DFT spread OFDM symbol (hereinafter, simply referred to as OFDM symbol) due to the characteristics of a DFT spread OFDM system.
  • LTE-Advanced basic communication services must be provided even at a higher frequency spectrum and a higher mobile velocity than LTE.
  • the reference symbol frequency per slot in the time axis may be increased.
  • a method of increasing the reference symbols in the time domain a method of simply increasing the number of OFDM symbols transmitting reference symbols per slot may be considered.
  • this is certainly a performance improvement in terms of channel estimation, but the overhead due to the reference symbol is increased, resulting in a decrease in the data rate.
  • the reference symbol and data are multiplexed and transmitted in one OFDM symbol.
  • the ratio of the reference symbol in one OFDM symbol it is possible to increase the temporal frequency of the reference signal per slot while maintaining the overhead of the reference symbol per slot.
  • methods such as TDM, FDM, and CDM may be considered.
  • TDM method a method of multiplexing data and reference symbols in the time domain before the DFT during the generation of the DFT spread OFDM signal may be considered. In this case, an overhead caused by a cyclic prefix increases, interference between data and a reference symbol increases in the data receiving apparatus, and channel estimation becomes complicated.
  • the CDM method generally has the disadvantage of causing problems such as increase in CM and interference of data and reference symbols.
  • the present invention proposes a multiplex structure of data and reference symbols of an IFDM (Interleaved FDM) structure in which data and reference symbols are mixed with FDM.
  • IFDM Interleaved FDM
  • An object of the present invention is to multiplex data symbols and reference symbols into the same OFDM symbol while minimizing the increase in PAPR.
  • the present invention provides a DFT precoder for performing a DFT transform on a data symbol, and a data multiplexer for generating a reference OFDM symbol by frequency division multiplexing the DFT transformed data symbol and a reference symbol.
  • a receiver for receiving an OFDM symbol in which data symbols and reference symbols are frequency division multiplexed from a data transmission apparatus, a reference symbol extractor for extracting a reference symbol from the ODFM symbols, and the data using the reference symbol
  • a data receiving apparatus including a channel estimator for estimating a channel from a transmission device and an equalizer for equalizing the data symbols using the estimated channel.
  • the data symbol and the reference symbol receiving a frequency division multiplexed OFDM symbol from the data transmission apparatus, a reference symbol extracting unit for extracting a reference symbol from the ODFM symbol, using the reference symbol
  • a data receiving apparatus including a channel estimator for estimating a channel from the data transmission apparatus and an equalizer section for equalizing the data symbols by using the estimated channel.
  • a reference symbol can be frequently transmitted in time without increasing overhead.
  • data symbols and reference symbols can be multiplexed onto the same OFDM symbol while minimizing the increase in PAPR.
  • FIG. 1 is a diagram showing the structure of a data transmission apparatus according to an embodiment of the present invention.
  • FIG. 2 is a diagram showing the structure of a DFT precoder according to an embodiment of the present invention.
  • FIG. 3 is a diagram illustrating frequency multiplexing of a data symbol and a reference symbol according to an embodiment of the present invention.
  • FIG. 4 is a diagram illustrating a subframe structure according to an embodiment of the present invention.
  • FIG. 5 is a diagram illustrating the structure of a data receiving apparatus according to an embodiment of the present invention.
  • FIG. 6 is a diagram illustrating a structure of an equalization unit according to an embodiment of the present invention.
  • the data transmission apparatus 100 includes a DFT precoder 110, a multiplexer 120, a resource element mapper 130, an IFFT converter 140, a CP inserter 150, and a transmitter 160.
  • the DFT precoder 110 performs a DFT transform on the data symbols.
  • the data symbols received by the DFT precoder 110 may be complex data symbols that are channel coded, interleaved, scrambled, and modulated using modulation techniques such as BPSK, QPSK, and QAM.
  • modulation techniques such as BPSK, QPSK, and QAM.
  • the DFT precoder 110 may include a symbol receiver 210, an inserter 220, and a DFT converter 230.
  • the symbol receiver 210 receives a predetermined number of data symbols.
  • the number of data symbols received by the symbol receiver 210 may vary depending on the type of the ODFM symbol. For example, when the DFT precoder performs the DFT transform on the data symbols included in the data OFDM symbol, the symbol receiver 210 may receive M data symbols. In this case, the DFT converter 230 may perform M-point DFT conversion on M data symbols.
  • the symbol receiver 210 may receive M / 2 data symbols.
  • DFT transformed data symbols are inserted into a data OFDM symbol or a reference OFDM symbol.
  • the data OFDM symbol is a symbol including data or control channel information
  • the reference ODFM symbol is a symbol including data or control channel information and a reference symbol. That is, the data OFDM symbol is a symbol that does not include a reference symbol, and the reference ODFM symbol is a symbol that includes a reference symbol.
  • the inserting unit 220 inserts M / 2 '0's between M / 2 data symbols. can do.
  • the DFT converter 230 performs M-point DFT conversion on M / 2 data symbols into which M / 2 '0's are inserted.
  • the multiplexer 120 generates a reference OFDM symbol by frequency division multiplexing the DFT transformed data symbols 121 and the reference symbols 122.
  • frequency division multiplexing on the data symbols 121 and the reference symbols 122 will be described in detail with reference to FIG. 3.
  • FIG. 3 is a diagram illustrating multiplexing of a data symbol and a reference symbol in a frequency domain according to an embodiment of the present invention.
  • the DFT transformed data symbols 310, 311, 312, and 313 may be multiplexed alternately with the reference symbols 320, 321, 322, and 323.
  • the DFT transformed data symbols 310, 311, 312, and 313 correspond to odd-numbered subcarriers 330, 332, 334, and 336, and reference symbols 320, 321, 322, and 323.
  • the data symbols 310, 311, 312, and 313 and the reference symbols 320, 321, 322, and 323 alternate with each other and alternately correspond to subcarriers. Interleaved FDM).
  • data symbols 310, 311, 312, and 313 correspond to odd-numbered subcarriers 330, 332, 334, and 336
  • reference symbols 320, 321, 322, and 323 correspond to even-numbered subcarriers. While an embodiment corresponding to 331, 333, 335, and 227 is illustrated, the reverse is also possible in other embodiments of the present invention.
  • the correspondence relationship between each symbol and the subcarrier may be changed every OFDM symbol or every slot.
  • the data transmission apparatus according to the present invention is applied to the DFT spread OFDM scheme.
  • the data transmission apparatus according to the present invention can also be effectively applied to clustered DFT spread OFDM or N x DFT spread OFDM based on DFT spread OFDM.
  • FIG. 4 An embodiment of a subframe structure in the case of configuring a reference OFDM symbol in the IFDM form proposed by the present invention can be expressed as shown in FIG. 4.
  • the subframe 400 includes a first slot 410 and a second slot 420.
  • the first slot 410 may include a plurality of OFDM symbols 430, 440, 450, 460, 470, 480, and 490.
  • Each OFDM symbol 430, 440, 450, 460, 470, 480, 490 may include a cyclic prefix (CP) to prevent inter-symbol interference.
  • CP cyclic prefix
  • the first slot 410 may include a data OFDM symbol and a reference OFDM symbol.
  • Data OFDM symbols include only data symbols, while reference OFDM symbols include both data symbols and reference symbols.
  • the first slot 410 includes two reference OFDM symbols 440 and 480.
  • the OFDM symbol of 490 is also represented as a reference OFDM symbol in Fig. 4-> need to be changed to a data OFDM symbol.
  • the data OFDM symbols 430, 450, 460, 470, and 490 are referred to as reference OFDM symbols 440 and 480.
  • time multiplexed and included in the first slot 410 are referred to as reference OFDM symbols 440 and 480.
  • the reference slot may be transmitted to the data receiving apparatus more frequently than when the first slot 410 includes one reference OFDM symbol. Since the data receiving apparatus may receive the reference symbol more often, the channel between the data transmitting apparatus and the data receiving apparatus may be accurately estimated.
  • the first slot 410 includes five data OFDM symbols 430, 450, 460, 470, and 490 and two reference OFDM symbols 440 and 480 is illustrated.
  • the number and location of data OFDM symbols and the number and location of reference OFDM symbols included in the first slot 410 may be variably configured according to the design of the data transmission system.
  • the resource element mapper 130 maps frequency division multiplexed data symbols and reference symbols included in the reference OFDM symbol to a subcarrier. This may be referred to as mapping a reference OFDM symbol to a subcarrier.
  • the resource element mapper may map data symbols or reference symbols to subcarriers corresponding to each of the data symbols or the reference symbols.
  • the IFFT converter 140 performs an IFFT transform on the reference OFDM symbol mapped to the subcarrier.
  • the CP inserter 150 inserts a CP symbol into the IFFT transformed reference OFDM symbol.
  • the transmitter 160 transmits the CP-inserted reference OFDM symbol to the data receiving apparatus.
  • the present invention may be applied to the case where the data transmission apparatus 100 uses a plurality of transmission antennas.
  • the data receiver 500 may include a receiver 510, a reference symbol extractor 520, a channel estimator 530, and an equalizer 540.
  • the receiver 510 receives a reference OFDM symbol in which data symbols and reference symbols are frequency division multiplexed from a data transmission apparatus.
  • the reference symbol extractor 520 extracts only a reference symbol from the reference OFDM symbol.
  • data symbols and reference symbols are mapped to different subcarriers. Accordingly, the reference symbol extractor 520 may extract reference symbols included in a subcarrier different from the data symbol.
  • the data symbols and the reference symbols may be multiplexed alternately.
  • the reference symbol extractor 520 may simply extract the reference symbol by selecting the odd or even subcarriers.
  • the channel estimator 530 estimates a channel from the data transmitter to the data receiver by using the extracted reference symbol 522.
  • the reference symbol extractor 520 extracts a data symbol from the reference OFDM symbol, and the equalizer 540 equalizes the data symbol 521 using the estimated channel 531.
  • the equalizer 540 may include an FFT converter 610 and a channel compensator 620.
  • the FFT converter 610 performs an FFT operation on the data symbol 521 extracted from the reference OFDM symbol.
  • the data symbol subjected to the FFT operation is distorted in phase while passing through a channel from the data transmission apparatus to the data receiving apparatus.
  • the channel compensator 620 compensates the channel of the data symbol on which the FFT operation is performed. According to an embodiment, the channel compensator 620 may compensate the channel of the data symbol by using the channel estimated by the channel estimator 530.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • Discrete Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Power Engineering (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

L'invention concerne un dispositif de transmission de données pour la transmission d'un symbole OFDM de référence, généré par l'application du multiplexage par répartition en fréquence, à un symbole de référence et un symbole de données. L'invention concerne également un dispositif de réception de données pour l'évaluation d'un canal à l'aide du symbole OFDM de référence. Le dispositif de transmission de données est apte à transmettre le symbole OFDM de référence au dispositif de réception de données plus fréquemment sans grande augmentation d'un rapport valeur de crête sur valeur moyenne (PAPR) par multiplexage en fréquence des symboles de référence et de données. Le dispositif de réception de données est ainsi apte à effectuer une évaluation exacte du canal.
PCT/KR2010/003814 2009-06-12 2010-06-14 Structure de symbole de référence pour un système ofdm étalé par transformée de fourier rapide Ceased WO2010143926A2 (fr)

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Application Number Priority Date Filing Date Title
US13/377,720 US8891662B2 (en) 2009-06-12 2010-06-14 Reference symbol structure for DFT spread OFDM system

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KR20090052208 2009-06-12
KR10-2009-0052208 2009-06-12

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WO2010143926A3 WO2010143926A3 (fr) 2011-03-31

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CN103139125A (zh) * 2011-12-02 2013-06-05 华为技术有限公司 下行数据发送、接收方法及基站与用户终端
WO2013079034A1 (fr) * 2011-12-02 2013-06-06 华为技术有限公司 Procédé d'émission et de réception de données descendantes, station de base et terminal d'utilisateur
US9479378B2 (en) 2011-12-02 2016-10-25 Huawei Technologies Co., Ltd. Method for sending downlink data, method for receiving downlink data, base station, and user terminal

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KR101615385B1 (ko) 2016-04-25
US8891662B2 (en) 2014-11-18
US20120087393A1 (en) 2012-04-12
KR20100133918A (ko) 2010-12-22

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